The Mohs scale of mineral hardness is a qualitative ordinal scale that characterizes the scratch resistance of different minerals through 

Soapstone 1 · Slate 2.5-4 · Marble 3-4 · Limestone 3-4 · Travertine 4-5 · Sandstone 6-7 · Granite 6-7 · Natural Quartz 7.

The Mohs Scale of Hardness measures how a substance resists scratching by another material. Learn how to use the scale to identify rocks and 

Jaspers, Agates and Quartzes all have a hardness of approximately 7 to 7 1/2 and thus can be tumbled together. Rocks in this hardness range will be easiest for beginners. Amazonite, Labradorite and Unakite are all in the Feldspar family at a hardness of approximately 5 1/2 to 6 and can be tumbled together. It is recommended that when tumbling

The famous saying states, “to be between a rock and a hard place”. But, what about when the rock IS the hard place? Measuring the hardness of minerals is 

The rock is granite. Study its appearance, and note that it also comes under Division C. Identify the black, or dark, or green mineral as hornblende or pyroxene, by good cleavage and hardness. Note light-colored crystals, hard and with good cleavage, as feldspar. The specimen is diorite, gabbro, or diabase, hard to distinguish from one another.

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The Mohs scale is a chart of the relative hardness of the various minerals from softest to hardest. The scale was developed in 1822 by Frederich Mohs. Since hardness depends upon the crystallographic direction, there can be variations in hardness depending upon the direction in which one measures this property.

Diamonds are the hardest stones, while talc is a very soft mineral. The scale by which the hardness of gemstone minerals are measured is the Mohs Scale of 

This is why many gems and stones have a range of hardness, it depends on the specimen. On the chart below minerals with a higher number can scratch all minerals 

It is a common constituent of sedimentary rocks. In crystallized form, Calcite has a vitreous lustre. Absolute Hardness: 9. Mohs Hardness Scale - Hardness of